Jerome dies after Vincent goes into space and after he supplies him with more than a lifetimes supply of everything he will need to keep his identity a secret. Jerome goes into the incinerator where Vincent burns all of his skin and hair samples before going to work. He sits in the incinerator and then burns himself to death, sitting in the incinerator with his Olympic silver medal for swimming.
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Vincent is considered an in-valid. Jerome is a valid. Vincent needed Jerome's genes to work at Gattaca.
***MAJOR SPOILER***At the end of Gattaca, Jerome Eugene Morrow committed suicide. He managed to climb into the furnace where Vincent Freedman had burned his (Vincent's) cells and turned it on, thus killing himself and destroying all evidence that there was more than one Jerome Morrow.
Eugene
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Jerome had the perfect genes for swimming but only received a silver medal.